A nurse is caring for a client who has chronic hypertension. The client's morning vital signs include BP 140/80 mm Hg, heart rate 54/min, and respiratory rate 18/min. Which of the following medications should the nurse plan to withhold?

A. Hydrochlorothiazide does not affect heart rate and can be safely given. B. Lisinopril does not cause bradycardia. C. Atenolol is a beta-blocker that slows heart rate; withholding is necessary for bradycardia. D. Aspirin does not influence heart rate and is not contraindicated.